Introduction: In recent years, dialectical behavior therapy has been used as a therapy for treatment-resistant anxiety disorder. The current research has been done to investigate the efficacy of group training of dialectical behavior therapy concepts on improvement of emotional recognition strategies and decrease of Obsessive-Compulsive Disorder (OCD).Method: 30 women with OCD were selected by clinical interview and randomly divided into two experimental and control groups. The subjects of both groups completed Cognitive Emotion Regulation Questionnaire and Yale-Brown Obsessive-Compulsive Scale before starting the first treatment session and also after the last treatment session. Experimental group received 12 sessions (90 minutes) of dialectical behavior therapy. Data were analyzed by multivariate analysis of variance.Results: Results showed that there's a significant reduction in OCD symptoms (except sexual obsession and check compulsion) of experimental group in comparison with the control group. Moreover, Positive strategies of emotion regulation increase significantly in experimental group than control group.Discussion and Conclusion: Dialectical behavior therapy could help the patients with OCD, by training emotion regulation strategies, tolerance acceptance of negative emotion, to learn how to work effectively on their obsession.